Sawmill Enterprise 8.7.9 - Authentication Bypass

[+] Credits: John Page AKA Hyp3rlinx

[+] Website: hyp3rlinx.altervista.org

[+] Source: http://hyp3rlinx.altervista.org/advisories/SAWMILL-PASS-THE-HASH-AUTHENTICATION-BYPASS.txt

[+] ISR: ApparitionSec







Vendor:

===============

www.sawmill.net







Product:

========================

Sawmill Enterprise v8.7.9



sawmill8.7.9.4_x86_windows.exe

hash: b7ec7bc98c42c4908dfc50450b4521d0



Sawmill is a powerful heirarchical log analysis tool that runs on every

major platform.





Vulnerability Type:

===================================

Pass the Hash Authentication Bypass







CVE Reference:

==============

CVE-2017-5496







Security Issue:

=====================

Sawmill suffers from a classic "Pass The Hash" vulnerability whereby an

attacker who gains access to the hashed user account passwords

can login to the Sawmill interface using the raw MD5 hash values, allowing

attackers to bypass the work of offline cracking

account password hashes.





This issue usually is known to affect Windows systems e.g. (NT Pass the

Hash/Securityfocus, 1997). However, this vulnerability can also

present itself in a vulnerable Web application.



Sawmill account password hashes are stored under LogAnalysisInfo/ directory

in "users.cfg".



e.g.



users = {

  root_admin = {

    username = "admin"

    password_checksum = "e99a18c428cb38d5f260853678922e03"

    email_address = ""





This config file is stored local to the Sawmill application. However, if an

attacker gains access to a backup of the config that is

stored in some other location that is then compromised, it can lead to

subversion of Sawmills authenticaton process.



Moreover, since 'users.cfg' file is world readble a regular non Admin

Windows user who logs into the system running sawmill can now grab

a password hash and easily login to the vulnerable application without the

needing the password itself.





How to test?





Sawmill running (default port 8988), log off Windows and switch to a

"Standard" Windows non Administrator user.



1) Open "users.cfg" under Sawmills directory "C:\Program Files\Sawmill 8\LogAnalysisInfo" and copy the root_admin Admin password hash.



2) Go to the Sawmill login page in web browser http://VICTIM-IP:8988/ enter username 'admin' and the hash, Tada! your Admin.





Finally, Sawmill passwords are hashed using vulnerable MD5 algorithm and no

salt.





e.g.



password: abc123

MD5 hash:

e99a18c428cb38d5f260853678922e03







Disclosure Timeline:

=====================================

Vendor Notification: January 7, 2017

CVE-2017-5496 assigned : January 20

Request status : January 26

Vendor: Fix avail later in year still no ETA

Inform vendor public disclose date

February 18, 2017 : Public Disclosure







Network Access:

===============

Remote







Impact:

======================

Information Disclosure

Privilege Escalation







Severity Level:

================

High







[+] Disclaimer

The information contained within this advisory is supplied "as-is" with no

warranties or guarantees of fitness of use or otherwise.

Permission is hereby granted for the redistribution of this advisory,

provided that it is not altered except by reformatting it, and

that due credit is given. Permission is explicitly given for insertion in

vulnerability databases and similar, provided that due credit

is given to the author. The author is not responsible for any misuse of the

information contained herein and accepts no responsibility

for any damage caused by the use or misuse of this information. The author

prohibits any malicious use of security related information

or exploits by the author or elsewhere.